Date: Sun, 31 Oct 2004 23:56:17 +0100 (CET) From: Lukas Ertl <le@FreeBSD.org> To: freebsd@newmillennium.net.au Cc: freebsd-current@FreeBSD.org Subject: Re: Gvinum RAID5 performance Message-ID: <20041031235355.R1732@korben.prv.univie.ac.at> In-Reply-To: <002401c4bf9c$c4fee8e0$0201000a@riker> References: <002401c4bf9c$c4fee8e0$0201000a@riker>
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On Mon, 1 Nov 2004 freebsd@newmillennium.net.au wrote: > Now, running a dd from a plex gives me less performance than running a > dd from one of the subdisks, even though the array is not running in > degraded mode. I'd consider this normal behaviour, since you have to go through the offset calculation. > 31237376, 31613728, 31990080, 32366432, 32742784, 33119136, <machine > consistently locks up at this point> This should be fixed with my latest commit to geom_vinum_plex.c. > On a final note, I'd like to implement the ability to grow RAID5 plexes > - any suggestions on where to start? You need to relocate all parity stripes when you want to do that. cheers, le -- Lukas Ertl http://homepage.univie.ac.at/l.ertl/ le@FreeBSD.org http://people.freebsd.org/~le/
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